[takeda]

Since this targets vulnerability system, providing system version is more valuable than what model of kindle readers are vulnerable. Especially that Amazon either already patched this or surely will do it very soon.

Given that it said "every Kindle with a 5.6.5" I would assume that most likely it was every kindle at the time the exploit was written.

[bdelay]

Correct. At the time, this worked on the Paperwhite 2, 3, Voyage, and Touch. Forgot which version of the touch, they update that one a lot. I'll try to clarify that a bit better when I get some time.

While this exploit is obviously closed, Kindles can still be jailbroken via a new method. See the mobileread forums.